package com.ssm.zhou.utils;
import java.io.IOException;  
import java.io.InputStream;  
import java.math.BigDecimal;
import java.text.SimpleDateFormat;  
import java.util.ArrayList;  
import java.util.Date;
import java.util.List;  
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Cell;  
import org.apache.poi.ss.usermodel.Row;  
import org.apache.poi.ss.usermodel.Sheet;  
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;  


public class ExcelUtils {
    private final static String excel2003L =".xls";    //2003- 版本的excel  
    private final static String excel2007U =".xlsx";   //2007+ 版本的excel  

    /** 
     * 描述：获取IO流中的数据，组装成List<List<Object>>对象 
     * @param in,fileName 
     * @return 
     * @throws IOException  
     */  
    public  List<List<Object>> getBankListByExcel(InputStream in,String fileName){ 
        List<List<Object>> list = null;  
    	try{


            //创建Excel工作薄  
            Workbook work = this.getWorkbook(in,fileName);  

            if(null == work){  
                throw new Exception("创建Excel工作薄为空！");  
            }  
            Sheet sheet = null;  //页数
            Row row = null;  //行数
            Cell cell = null;  //列数

            list = new ArrayList<List<Object>>();  
            //遍历Excel中所有的sheet  

            for (int i = 0; i < work.getNumberOfSheets(); i++) {  
            	
                sheet = work.getSheetAt(i);  
                if(sheet==null){continue;}  

                //遍历当前sheet中的所有行  
                for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {  
                    row = sheet.getRow(j);  
                    if(row==null||row.getFirstCellNum()==j){continue;}  
                    //遍历所有的列  
                    List<Object> li = new ArrayList<Object>();  
                    for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {  
                        cell = row.getCell(y);  
                        li.add(this.getValue(cell));  
                    }  
                    list.add(li);  
                }  
            }  
    	}catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}


        return list;  

    }  

    /** 
     * 描述：根据文件后缀，自适应上传文件的版本  
     * @param inStr,fileName 
     * @return 
     * @throws Exception 
     */  
    public  Workbook getWorkbook(InputStream inStr,String fileName){  
        Workbook wb = null;  
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        System.out.println(fileType);
        if(excel2003L.equals(fileType)){  
            try {
				wb = new HSSFWorkbook(inStr);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
		 		 throw new RuntimeException(e);
			}  //2003-  
        }else if(excel2007U.equals(fileType)){  

        	 try{
                 wb = new XSSFWorkbook(inStr);  	 
        	 }catch(Exception e){
        		 e.printStackTrace();
        		 throw new RuntimeException(e);
        	 }


        }else{  
            throw new RuntimeException("解析的文件格式有误！");  
        }  

        return wb;  
    }  

    /** 
     * 描述：对表格中数值进行格式化 
     * @param cell 
     * @return 
     */  
  //解决excel类型问题，获得数值  
    public  String getValue(Cell cell) {  
        String value = "";  
        if(null==cell){  
            return value;  
        }  
        switch (cell.getCellType()) {  
        //数值型  
        case Cell.CELL_TYPE_NUMERIC:  
            if (HSSFDateUtil.isCellDateFormatted(cell)) {  
                //如果是date类型则 ，获取该cell的date值  
                Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());  
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");  
                value = format.format(date);;  
            }else {// 纯数字  
                BigDecimal big=new BigDecimal(cell.getNumericCellValue());  
                value = big.toString();  
                //解决1234.0  去掉后面的.0  
                if(null!=value&&!"".equals(value.trim())){  
                     String[] item = value.split("[.]");  
                     if(1<item.length&&"0".equals(item[1])){  
                         value=item[0];  
                     }  
                }  
            }  
            break;  
            //字符串类型   
        case Cell.CELL_TYPE_STRING:  
            value = cell.getStringCellValue().toString();  
            break;  
        // 公式类型  
        case Cell.CELL_TYPE_FORMULA:  
            //读公式计算值  
            value = String.valueOf(cell.getNumericCellValue());  
            if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串  
                value = cell.getStringCellValue().toString();  
            }  
            break;  
        // 布尔类型  
        case Cell.CELL_TYPE_BOOLEAN:  
            value = " "+ cell.getBooleanCellValue();  
            break;   
        default:  
            value = cell.getStringCellValue().toString();  
    }  
    if("null".endsWith(value.trim())){  
        value="";  
    }  
  return value;  
    }  
}
